Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Partition coefficient

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
partition coefficient
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
Study period:
2013
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
according to guideline
Guideline:
EU Method A.8 (Partition Coefficient)
Version / remarks:
31 May 2008
Deviations:
no
Principles of method if other than guideline:
Estimation of log Kow from solubility of the test substance in n-Octanol and water
GLP compliance:
no
Type of method:
estimation method (solubility ratio)
Partition coefficient type:
octanol-water
Type:
log Pow
Partition coefficient:
2
Temp.:
20 °C
pH:
4
Remarks on result:
other: weighted log Kow
Type:
log Pow
Partition coefficient:
2.01
Temp.:
20 °C
pH:
7
Remarks on result:
other: weighted log Kow
Type:
log Pow
Partition coefficient:
2.57
Temp.:
20 °C
pH:
9
Remarks on result:
other: weighted log Kow
Conclusions:
The n-octanol/water partition coefficient (log Kow) of Stearic acid 3-(dimethylaminopropyl)amide was estimated by calculation based on the solubility of the test substance in n-Octanol and water and taking into account the presence of the free and protonated amine at different pH values. The weighted log Kow at pH 4, 7 and 9 are 2.00, 2.01 and 2.57, respectively.
Executive summary:

According to EU method A.8, 31 May 2008 the n-octanol/water partition coefficient (log Kow) of Stearic acid 3-(dimethylaminopropyl)amide was estimated by calculation based on the solubility of the test substance in n-Octanol and water.

solubility [g/L]

log Kow

n-octanol

water

free amine

151

0.01

4.18

protonated amine

22

0.22

2.04

 

Weighted log Kow were calculated taking into account the presence of the free and protonated amine at different pH values.

free amine [%]

protonated amine [%]

weighted log Kow

pH 4

0

100

2.00

pH 7

0.4

99.6

2.01

pH 9

26.2

73.8

2.57

The weighted log Kow at pH 4, 7 and 9 are 2.00, 2.01 and 2.57, respectively.

Description of key information

The weighted n-octanol/water partition coefficients (log Kow) of  Stearic acid 3-(dimethylaminopropyl)amide at pH 4, 7 and 9 are 2.00, 2.01 and 2.57, respectively (EU method A.8; estimated by calculation based on the solubility of the test substance in n-Octanol and water).

Key value for chemical safety assessment

Log Kow (Log Pow):
2.01
at the temperature of:
20 °C

Additional information

According to EU method A.8, 31 May 2008 the n-octanol/water partition coefficient (log Kow) of Stearic acid 3-(dimethylaminopropyl)amide was estimated by calculation based on the solubility of the test substance in n-Octanol and water.

The test substance is present to a larger extent as protonated amine as well as to a minor extent as neutral form (free amine) at environmentally relevant pH in the range of pH 4-9. As this can have a marked effect on the partition coefficient, the log Kow was estimated from the individual solubilities at pH 4, 7 and 9 to cover the relevant range.

 

Weighted log Kow were calculated taking into account the presence of the free and protonated amine at different pH values.

The weighted log Kow at pH 4, 7 and 9 are 2.00, 2.01 and 2.57, respectively.